Buggy code:
private class ListRewriter { protected String contantSeparator ; protected int startPos ; protected RewriteEvent [ ] list ; private Stack copyRangeEndStack ; protected final ASTNode getOriginalNode ( int index ) { } protected String getSeparatorString ( int nodeIndex ) { } protected int getInitialIndent ( ) { } protected int getNodeIndent ( int nodeIndex ) { } protected int getStartOfNextNode ( int nextIndex , int defaultPos ) { } protected int getEndOfNode ( ASTNode node ) { } public final int rewriteList ( ASTNode parent , StructuralPropertyDescriptor property , int offset , String keyword , String separator ) { } private boolean insertAfterSeparator ( ASTNode node ) { } public final int rewriteList ( ASTNode parent , StructuralPropertyDescriptor property , int offset , String keyword ) { } private void initCopyRangeChecks ( ASTNode parent , StructuralPropertyDescriptor property ) { } private void checkForRangeStart ( ASTNode node ) { } private void checkForRangeEnd ( ASTNode node ) { } } private int rewriteRequiredNode ( ASTNode parent , StructuralPropertyDescriptor property ) { } private int rewriteNode ( ASTNode parent , StructuralPropertyDescriptor property , int offset , ASTRewriteFormatter . Prefix prefix ) { } private int rewriteJavadoc ( ASTNode node , StructuralPropertyDescriptor property ) { } private int rewriteBodyNode ( ASTNode parent , StructuralPropertyDescriptor property , int offset , int endPos , int indent , ASTRewriteFormatter . BlockContext context ) { } private int rewriteOptionalQualifier ( ASTNode parent , StructuralPropertyDescriptor property , int startPos ) { } private class ParagraphListRewriter extends ASTRewriteAnalyzer . ListRewriter { public static final int DEFAULT_SPACING = 1 ; private int initialIndent ; private int separatorLines ; public ParagraphListRewriter ( int initialIndent , int separator ) { } protected int getInitialIndent ( ) { } protected String getSeparatorString ( int nodeIndex ) { } private ASTNode getNode ( int nodeIndex ) { } private int getNewLines ( int nodeIndex ) { } private int countEmptyLines ( ASTNode last ) { } private boolean containsOnlyWhitespaces ( IDocument doc , int line ) throws BadLocationException { } } private int rewriteParagraphList ( ASTNode parent , StructuralPropertyDescriptor property , int insertPos , int insertIndent , int separator , int lead ) { } private int rewriteOptionalTypeParameters ( ASTNode parent , StructuralPropertyDescriptor property , int offset , String keyword ) { } private boolean isAllOfKind ( RewriteEvent [ ] children , int kind ) { } private int rewriteNodeList ( ASTNode parent , StructuralPropertyDescriptor property , int pos , String keyword , String separator ) { } private void rewriteMethodBody ( MethodDeclaration parent , int startPos ) { } private int rewriteExtraDimensions ( ASTNode parent , StructuralPropertyDescriptor property , int pos ) { } private void rewriteExtraDimensions ( int oldDim , int newDim , int pos , TextEditGroup editGroup ) { } private int getPosAfterLeftBrace ( int pos ) { } final int getIndent ( int pos ) { } final void doTextInsert ( int insertOffset , ASTNode node , int initialIndentLevel , boolean removeLeadingIndent , TextEditGroup editGroup ) { } private String getCurrentLine ( String str , int pos ) { } private void rewriteModifiers ( ASTNode parent , StructuralPropertyDescriptor property , int offset ) { } private int rewriteModifiers2 ( ASTNode node , ChildListPropertyDescriptor property , int pos ) { RewriteEvent event = getEvent ( node , property ) ; if ( ( event == null ) || ( ( event . getChangeKind ( ) ) == ( RewriteEvent . UNCHANGED ) ) ) { return doVisit ( node , property , pos ) ; } RewriteEvent [ ] children = event . getChildren ( ) ; boolean isAllInsert = isAllOfKind ( children , RewriteEvent . INSERTED ) ; boolean isAllRemove = isAllOfKind ( children , RewriteEvent . REMOVED ) ; if ( isAllInsert || isAllRemove ) { try { pos = getScanner ( ) . getNextStartOffset ( pos , false ) ; } catch ( CoreException e ) { handleException ( e ) ; } } int endPos = rewriteNodeList ( node , property , pos , "" , "<seq2seq4repair_space>" ) ; if ( isAllInsert ) { doTextInsert ( endPos , "<seq2seq4repair_space>" , getEditGroup ( children [ ( ( children . length ) - 1 ) ] ) ) ; } else if ( isAllRemove ) { try { <START_BUG> int nextPos = getScanner ( ) . getNextStartOffset ( endPos , true ) ; <END_BUG> doTextRemove ( endPos , ( nextPos - endPos ) , getEditGroup ( children [ ( ( children . length ) - 1 ) ] ) ) ; return nextPos ; } catch ( CoreException e ) { handleException ( e ) ; } } return endPos ; } private void replaceOperation ( int posBeforeOperation , String newOperation , TextEditGroup editGroup ) { } private void rewriteOperation ( ASTNode parent , StructuralPropertyDescriptor property , int posBeforeOperation ) { } public void postVisit ( ASTNode node ) { } public void preVisit ( ASTNode node ) { } final void doCopySourcePreVisit ( RewriteEventStore . CopySourceInfo [ ] infos , Stack nodeEndStack ) { } final void doCopySourcePostVisit ( ASTNode node , Stack nodeEndStack ) { } public boolean visit ( CompilationUnit node ) { } public boolean visit ( TypeDeclaration node ) { } private void rewriteReturnType ( MethodDeclaration node , boolean isConstructor , boolean isConstructorChange ) { } public boolean visit ( MethodDeclaration node ) { } public boolean visit ( Block node ) { } public boolean visit ( ReturnStatement node ) { } public boolean visit ( AnonymousClassDeclaration node ) { } public boolean visit ( ArrayAccess node ) { } public boolean visit ( ArrayCreation node ) { } private Type getElementType ( ArrayType parent ) { } private int getDimensions ( ArrayType parent ) { } public boolean visit ( ArrayInitializer node ) { } public boolean visit ( ArrayType node ) { } public boolean visit ( AssertStatement node ) { } public boolean visit ( Assignment node ) { } public boolean visit ( BooleanLiteral node ) { }

Fix:
int nextPos = getScanner ( ) . getNextStartOffset ( endPos , false ) ;